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The core `@feathersjs/feathers` module provides the ability to initialize a new Feathers application instance. It works in Node, React Native and the browser (see the [client](./client.md) chapter for more information). Each instance allows for registration and retrieval of [services](./services.md), [hooks](./hooks.md), plugin configuration, and getting and setting configuration options. An initialized Feathers application is referred to as the **app object**.

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The `@feathersjs/authentication-client` module allows you to easily authenticate a Feathers client against a Feathers server. It is not required, but makes it easier to implement authentication in your client by automatically storing and sending the access token and handling re-authenticating when a websocket disconnects.

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The `JWTStrategy` is an [authentication strategy](./strategy.md) included in `@feathersjs/authentication` for authenticating [JSON web tokens (JWT)](https://jwt.io/):

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`@feathersjs/authentication-local` provides a `LocalStrategy` for authenticating with a username/email and password combination, e.g.

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`@feathersjs/authentication-oauth` allows to authenticate with over 180 OAuth providers (Google, Facebook, GitHub etc.) using [grant](https://github.com/simov/grant), an OAuth middleware module for NodeJS.

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The `AuthenticationService` is a [Feathers service](../services.md) that allows to register different [authentication strategies](./strategy.md) and manage access tokens (using [JSON web tokens (JWT)](https://jwt.io/) by default). This section describes

To connect to a Feathers server in NodeJS, install the desired client connection library (here, `socket.io-client`), alongside the Feathers core library, and the connection-specific library:

Then initialize like this:

React Native usage is the same as for the [Node client](#node). Install the required packages into your [React Native](https://facebook.github.io/react-native/) project.

Then in the main application file:

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`@feathersjs/client` is a module that bundles the separate Feathers client-side modules into one file which can be loaded directly in the browser through a `<script>` tag and in most other JavaScript runtimes.

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`@feathersjs/rest-client` allows to connect to a service exposed through a REST HTTP transport (e.g. with [Koa](../koa.md#rest) or [Express](../express.md#rest)) using [fetch](https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API), [Superagent](http://visionmedia.github.io/superagent/) or [Axios](https://github.com/mzabriskie/axios).